// yield/queue/stl_event_queue.hpp

// Copyright (c) 2011 Minor Gordon
// All rights reserved

// This source file is part of the Yield project.

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Yield project nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL Minor Gordon BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef _YIELD_QUEUE_STL_EVENT_QUEUE_HPP_
#define _YIELD_QUEUE_STL_EVENT_QUEUE_HPP_

#include "yield/assert.hpp"
#include "yield/event_queue.hpp"

#include <queue>

namespace yield {
namespace queue {
class STLEventQueue : public EventQueue, private std::queue<Event*> {
public:
  // yield::EventQueue
  YO_NEW_REF Event& dequeue() {
    debug_assert_false(std::queue<Event*>::empty());
    return *trydequeue();
  }

  bool enqueue(YO_NEW_REF Event& event) {
    std::queue<Event*>::push(&event);
    return true;
  }

  YO_NEW_REF Event* timeddequeue(const Time&) {
    return trydequeue();
  }

  YO_NEW_REF Event* trydequeue() {
    if (!std::queue<Event*>::empty()) {
      Event* event = std::queue<Event*>::front();
      std::queue<Event*>::pop();
      return event;
    } else
      return NULL;
  }
};
}
}

#endif
